JP2013089987A - Projector and image drawing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable display of a predetermined image corresponding to a writing operation on a projection surface using a projector.SOLUTION: A user writes positioning marks (M1, M2) and keywords (K1, K2) on a whiteboard 300. Their trajectories are photographed by a digital camera (or a photographing unit mounted on a projector). The projector recognizes the positioning marks and the keywords respectively, and draws images (I1, I2) associated with the keywords in a drawing area represented by the positioning marks.

Description

  The present invention relates to a technique for drawing an image according to content by a projector.

  Some projectors have an interactive function. Here, the interactive function refers to a function capable of superimposing and drawing characters corresponding to a user's writing operation trajectory on an original image projected by a projector (for example, Patent Document 1). reference).

JP2011-2650A

The technique described in Patent Document 1 displays a composite image in which a line corresponding to a locus of a pointing device is superimposed on an original image. When using such a technology, when a user tries to draw an image that takes time to draw by handwriting (or an image that cannot be expressed by handwriting) or a figure that requires accuracy such as a graph, It can be difficult.
Therefore, an object of the present invention is to enable a projector to display a predetermined image corresponding to an operation in writing on a projection surface.

A projector according to an aspect of the present invention recognizes an image to be drawn and a drawing area for drawing the image based on a trajectory of a symbol written on the projection surface, and the recognition unit recognizes the image to be drawn An acquisition unit that acquires image data representing the image that has been performed, and the image represented by the image data acquired by the acquisition unit is rendered in the drawing area recognized by the recognition unit of the projection surface And a drawing control unit to be controlled.
According to this projector, it is possible to display a predetermined image corresponding to the operation in writing on the projection surface.

In a preferred aspect, the acquisition unit acquires the image data and identification information associated with the image data, and the recognition unit recognizes a drawing area designated on the projection surface based on the trajectory. A position recognition unit; and an identification information recognition unit that recognizes the identification information based on the trajectory, wherein the drawing control unit is associated with the identification information recognized by the identification information recognition unit. The image represented by the data may be drawn in the drawing area recognized by the position recognition unit on the projection surface.
According to this aspect, it is possible to display an image corresponding to the identification information.

In another preferred embodiment, the identification information includes a predetermined keyword, and the identification information recognition unit may recognize the identification information by determining whether the keyword is included in the trajectory. .
According to this aspect, the user can display an image corresponding to the keyword by writing the keyword.

In still another preferred aspect, the position recognition unit recognizes a plurality of the drawing areas, the identification information recognition unit recognizes a plurality of the identification information, and the drawing control unit includes the drawing area and the identification information. The correspondence relationship between the drawing area and the identification information may be determined based on the position or the order in which the drawing area and the identification information are recognized.
According to this aspect, it is possible to display each of a plurality of images represented by a plurality of image data in a desired drawing area.

In still another preferred aspect, the identification information includes information indicating a color or shape of a locus that designates the drawing area, and the identification information recognition unit recognizes the identification information based on the color or shape of the locus. May be.
According to this aspect, it is possible to distinguish the image to be displayed based on the color or shape of the locus that designates the drawing area.

In still another preferred aspect, the recognition unit includes a control information recognition unit that recognizes control information for controlling image reproduction based on the trajectory, and the drawing control unit is controlled by the control information recognition unit. Image reproduction may be controlled in accordance with the recognized control information.
According to this aspect, it is possible to control the image reproduction mode by a writing operation.

In still another preferred aspect, the drawing control unit may update the image when a locus recognized by the recognition unit changes to satisfy a predetermined condition.
According to this aspect, it is possible to rewrite or erase an image.

The image drawing method according to another aspect of the present invention recognizes an image to be drawn and a drawing area for drawing the image based on a locus of a symbol written on the projection surface, and the recognized Image data representing an image is acquired, and the image represented by the acquired image data is drawn in the recognized drawing area of the projection surface.
According to this image drawing method, it is possible to display a predetermined image corresponding to the operation in writing on the projection surface.

The figure which shows the whole structure of a projection system. The block diagram which shows the structure of a projector. The figure which illustrates a positioning mark. The figure which illustrates a positioning mark. The figure which illustrates a content link table. The flowchart which shows the process which a projector performs. The flowchart which shows a recognition process. The figure which shows the data structure of drawing area data. The figure which shows the data structure of keyword area data. The flowchart which shows a drawing process. The figure which shows the display example of the locus | trajectory by a user and an interactive image. The block diagram which shows the structure of a projector. The figure which illustrates a control mark. The block diagram which shows the structure of a projector and information processing apparatus. The block diagram which shows the structure of a projector and a digital camera.

[First Embodiment]
FIG. 1 is a diagram showing an overall configuration of a projection system 10 according to an embodiment of the present invention. The projection system 10 is a so-called interactive projection system, and is a system that can draw an image (still image or moving image) according to the locus of a symbol (character or graphic) written by a user. The user is, for example, a teacher who teaches students to study or a lecturer who gives lectures to students.

  The projection system 10 includes a projector 100, a whiteboard 300, and a pen 400. The whiteboard 300 functions as a projection surface on which an image is projected by the projector 100 and is a plate-like instrument on which a user can write characters and figures with the pen 400. The pen 400 is an instrument for drawing a locus by attaching a color material (ink or the like) to the whiteboard 300. Note that there may be a plurality of pens 400 having different colors, as will be described later. Further, the writing by the user may be performed by a stamp in which predetermined characters and figures are engraved instead of the pen 400.

  The projector 100 is an electronic device for projecting and displaying an image on the whiteboard 300. A display element and a light source used for the projector 100 are not particularly limited. Although the display method of the projector 100 is not particularly limited, it is preferably a short-focus type for hanging on the wall so as not to prevent writing by the user or to cause a lot of user shadow on the projection surface. For example, the projector 100 desirably projects an image from above the whiteboard 300 as shown in FIG.

  Further, the projector 100 has a function of photographing the whiteboard 300. More specifically, the projector 100 captures a trajectory written on the whiteboard 300 by the user. This shooting function is desirably a function for shooting a moving image (that is, a function equivalent to a digital video camera). However, if the whiteboard 300 can be repeatedly shot at a predetermined timing, a still image instead of a moving image is used. Shooting with is also sufficient.

  FIG. 2 is a block diagram showing a more specific configuration of the projector 100. The projector 100 includes an imaging unit 110, a recognition unit 120, a first acquisition unit 130, a second acquisition unit 140, a storage unit 150, a drawing control unit 160, and a projection unit 170.

  The imaging unit 110 is a unit that images the projection surface. The imaging unit 110 includes an image sensor such as a charge coupled device (CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor, and an image processing circuit that generates and outputs image data from a signal supplied by the image sensor. Prepare. The imaging unit 110 supplies the image data to the recognition unit 120.

  The recognizing unit 120 is means for recognizing the locus of the symbol written by the pen 400. The recognizing unit 120 recognizes the trajectory of the symbol written on the projection surface by the user based on the image data supplied from the photographing unit 110. Here, the symbol refers to a character or a figure that can be recognized by the recognition unit 120. The characters here are not limited to kanji and alphabets, but numbers and symbols also correspond to this. The recognition unit 120 has a function of recognizing these characters and predetermined figures.

  The first acquisition unit 130 is means for acquiring first content representing the original image. The first content is data including at least image data representing the original image (first image data). On the other hand, the second acquisition unit 140 is means for acquiring second content representing an image (hereinafter, also referred to as “interactive image”) displayed in accordance with a locus drawn by the user. The second content is data including at least image data representing the interactive image (second image data).

  Here, the content refers to data including at least an image projected on the projection surface. The content is, for example, data in JPEG (Joint Photographic Experts Group) format for still images and MPEG (Moving Picture Experts Group) -2 format for moving images. The original image is an image projected before the user writes on the projection surface, and the interactive image is an image projected so as to be superimposed on the original image according to the user's writing. It is.

  The first acquisition unit 130 acquires the first content from the external device by communicating with the external device such as a personal computer, for example. On the other hand, the second acquisition unit 140 acquires the second content stored in the storage unit 150 and identification information associated with the content. The storage unit 150 includes a storage medium 151 (such as a hard disk or a flash memory) that stores data, and a table (hereinafter referred to as “the second content” described above and a correspondence between the second content and a keyword that is identification information thereof. Content link table ").

  Unlike the second content, the first content is not essential content in the present invention. In other words, the interactive image may be projected onto the projection surface so that the interactive image overlaps with the original image being projected, but only the interactive image may be projected while the original image is not projected. Therefore, the first acquisition unit 130 is not essential for the implementation of the present invention.

  The drawing control unit 160 is a unit that controls drawing of an image according to content. The drawing control unit 160 supplies the projection unit 170 with an image signal for projecting an original image, an interactive image, or a composite image obtained by superimposing these based on at least one of the first content and the second content. The drawing control unit 160 operates according to the recognition result by the recognition unit 120 when projecting an image including an interactive image. Specifically, the drawing control unit 160 acquires the second content according to the recognition result by the recognition unit 120, calculates the drawing position of the interactive image and the magnification at the time of drawing, and displays the interactive image according to the calculation result. Let it draw.

  The recognition unit 120, the first acquisition unit 130, the second acquisition unit 140, and the drawing control unit 160 can be realized by a CPU (Central Processing Unit), a memory, an image processing circuit, and the like. These may be operated by a single operating entity (for example, CPU), or may be operated by cooperation of a plurality of operating entities.

  The projection unit 170 is a means for displaying an image by projecting it onto a projection surface. The projection unit 170 includes, for example, a lamp that functions as a light source and a liquid crystal panel that functions as an optical modulator that modulates light emitted from the light source, and light modulated in accordance with an image signal supplied from the drawing control unit 160. Is projected onto the projection surface. However, the configuration of the projection unit 170 is not limited to this, and a display device other than the liquid crystal may be used, or either light transmission or reflection may be used.

  In more detail, the recognition unit 120 includes a position recognition unit 121 and an identification information recognition unit 122. The position recognition unit 121 is a means for recognizing a position where an interactive image is to be drawn (hereinafter referred to as a “drawing area”) based on a trajectory by the pen 400, and the identification information recognition unit 122 reads the interactive image to be drawn by the pen. It is a means for recognizing based on the trajectory 400. The position recognition unit 121 recognizes the drawing area by recognizing a predetermined mark (hereinafter referred to as “positioning mark”) for designating the drawing area from the locus of the pen 400. Further, the identification information recognition unit 122 recognizes an interactive image to be drawn by recognizing a character string corresponding to a keyword to be described later from the locus of the pen 400. For the recognition by the identification information recognition unit 122, a well-known OCR (Optical Character Recognition) technique can be used.

  Specifically, the recognizing unit 120 analyzes an image represented by the image data supplied from the photographing unit 110 to identify an image corresponding to the trajectory of the pen 400. If the identified image is a character, identification information is identified. Recognition is performed by the recognition unit 122. If the identified image is not a character, the position recognition unit 121 performs recognition. More specifically, for example, the recognition unit 120 first determines whether or not the image can be recognized as a character, and determines whether or not the image can be recognized as a positioning mark when the image cannot be recognized as a character. . However, the recognition unit 120 may first recognize a positioning mark and then recognize a keyword, as will be described later. That is, the order in which the position recognition unit 121 and the identification information recognition unit 122 perform recognition can be changed depending on a specific algorithm.

  FIG. 3 is a diagram illustrating an example of a positioning mark. The positioning mark M11 shown in the figure is a figure for designating the boundary of the drawing area. In this example, the upper end and the left end of the drawing area are defined by the position of the point p1 of the figure such as “L” in the alphabet. The lower end and the right end of the drawing area are defined by the position of the point p2. Since the positioning mark M11 is actually handwritten, it is not always a perfect straight line as shown in the figure, and the corners are not necessarily a right angle. The position recognizing unit 121 compares the shape of the locus by the pen 400 with a predetermined shape of the positioning mark, and recognizes that the positioning mark has been written when they match a predetermined ratio or more. A known pattern recognition technique can be used for this recognition.

FIG. 4 is a diagram illustrating another example of the positioning mark. The positioning mark M12 is a rectangular (or square) graphic, and in this case, the entire inside of the graphic is recognized as a drawing area. Further, the positioning mark M13 is a circular figure, and in this case, either the entire inside of the figure or the rectangles indicated by the broken lines A1 and A2 in the drawing in contact with the figure is recognized as the drawing area. The
The positioning mark may be a combination of a plurality of figures instead of a single figure. The positioning marks M14a, M14b, M14c, and M14d indicate the drawing area A3 indicated by a broken line by the position of the vertex.
As described above, the positioning mark may be any figure as long as it is a predetermined figure.

  FIG. 5 is a diagram illustrating an example of a content link table. As shown in the figure, the content link table is a table in which the file path of the second content and the keyword are associated with each other. The file path here is information indicating the location of the second content. However, depending on the directory structure of the storage medium 151, a simple file name may be used instead.

  The configuration of the projection system 10 is as described above. Under this configuration, the user makes an oral explanation and writes a symbol on the whiteboard 300. At this time, the user may write symbols other than the positioning marks and keywords on the whiteboard 300. The projector 100 captures the whiteboard 300 at an appropriate timing and generates image data. The projector 100 analyzes the generated image data, and draws an interactive image on the projection surface when a predetermined condition is satisfied. It is assumed that the projector 100 is in an operable state, for example, by turning on the power in advance.

  FIG. 6 is a flowchart showing processing of the projector 100 related to drawing of an interactive image. In this process, the projector 100 first shoots the whiteboard 300 to generate image data (step S1), and executes a recognition process for recognizing the positioning mark or keyword from the locus by the user (step S2). Subsequently, the projector 100 executes a drawing process for drawing an interactive image (step S3). Thereafter, the projector 100 determines whether or not drawing is to be ended (step S4). If drawing is not to be ended, the processing from step S1 is repeated. The determination in step S4 is performed based on, for example, an event that the power of the projector 100 is turned off or a specific operation by the user.

  Note that, when recognizing an image, the coordinate system that can be used by the projector 100 includes a pixel based on image data (or a coordinate based on the whiteboard 300) and a pixel used by the projector 100 for projection. Is considered to be based on The projector 100 can use any coordinate system as long as the coordinate system for comparing images is unified with any one of the coordinate systems. In the present embodiment, a two-dimensional orthogonal coordinate system in which the horizontal direction of the whiteboard 300 is the X axis and the vertical direction is the Y axis is used for the coordinate system.

  FIG. 7 is a flowchart specifically showing the recognition processing in step S2. In this recognition process, the projector 100 determines whether or not a newly added locus exists in the image represented by the received image data (step S21). This determination is performed by extracting the difference between the latest image data received and the image data received before the latest image data. That is, when there is a significant difference between the images represented by these two image data, the projector 100 extracts the difference and sets this as a newly added locus.

  Next, the projector 100 determines whether or not the trajectory extracted in this way (that is, a newly added trajectory) can be recognized as a positioning mark (step S22). At this time, the projector 100 compares the extracted trajectory with a predetermined positioning mark to determine whether the trajectory corresponds to the positioning mark.

  The positioning mark may be erroneously recognized as a character depending on its shape. For example, the positioning mark M11 shown in FIG. 3 may be erroneously recognized as an alphabet “L” or a katakana “Le”. Further, in the case of the positioning mark M12 shown in FIG. 4, there is a possibility that the kanji “mouth” or the symbol “□ (SHIFT_JIS code 81A0 square)” may be erroneously recognized. In order to prevent such erroneous recognition, a difference is provided between the size of the positioning mark and the size of the character (keyword). Therefore, a rule may be set such that a character is smaller than a predetermined threshold.

  However, the size of characters may vary depending on the user because there are individual differences depending on habits and preferences. Therefore, it is desirable that the threshold value here can be set by each user. The means for setting the threshold can be realized, for example, by providing a button on the projector 100 and receiving a user operation. Alternatively, the means for setting the threshold causes the user to enter one or several characters in advance on the whiteboard 300 before executing the recognition process, and determines the character size based on the image data obtained by capturing the character, A threshold value may be set (on the projector 100 side) based on the size of the character.

  If the positioning mark can be recognized in this way, the projector 100 generates and records drawing area data based on the recognized positioning mark (step S23). On the other hand, when the positioning mark cannot be recognized, the projector 100 skips (omits) the process of step S23 and executes the next process. The drawing area data is data for associating the drawing area with an interactive image drawn in the drawing area.

  FIG. 8 is a diagram illustrating a data structure of the drawing area data. The drawing area data is data in which the coordinates of the drawing area are associated with a pointer for referring to keyword area data representing a keyword corresponding to the drawing area. The coordinates of the drawing area are, for example, the coordinates of the four vertices when the drawing area is a rectangle. The pointer is data representing the position on the memory where the keyword area data is stored. Note that the initial value of the pointer is “null”, that is, nothing is defined.

  FIG. 9 shows the data structure of keyword area data. The keyword area data is data in which the coordinates of the area where the keyword is recognized (hereinafter referred to as “keyword area”) and the character string recognized as the keyword are associated with each other. The keyword area is an area defined to include the entire character string recognized as a keyword, and is typically a rectangular area. The keyword area is appropriately defined according to the actual size of the character string recognized as a keyword, but it is desirable that the keyword area does not become larger than necessary compared to the size of the character string.

  When the projector 100 generates such drawing area data or skips this processing, the projector 100 determines whether or not the newly added locus can be recognized as a keyword (step S24). When the projector 100 can recognize the keyword, the projector 100 generates and records keyword area data (step S25). If the projector 100 cannot recognize the keyword, it skips the process of step S25.

  Thereafter, the projector 100 determines whether or not the generated and recorded drawing area data includes a pointer value “null” (step S26). If there is such drawing area data, the projector 100 identifies a keyword that satisfies a predetermined condition with the drawing area represented by the drawing area data, and the keyword area data of the keyword, the drawing area data, Is associated with the pointer (step S27). As a result, the pointer value of the drawing area data is changed from “null” to a value indicating the position of the keyword area data. If the number of keyword area data is larger than the number of drawing area data, the projector 100 does not have to execute the process of step S27.

  The conditions here are for determining the correspondence between the drawing area and the keyword. This condition is determined based on the relative position between the drawing area and the keyword area and the order in which the drawing area and the keyword area are recognized. For example, a keyword corresponding to a certain drawing area may be a keyword that is recognized first after the drawing area is recognized, or a keyword that is closest to the drawing area. Alternatively, if a rule such as “keyword is written to the left of the corresponding drawing area” is provided in advance, the keyword corresponding to a certain drawing area is a character recognized in a predetermined direction (left) as viewed from the drawing area. Of the columns, the keyword in the keyword area that is closest to the drawing area can be used. The distance referred to here may be a line segment connecting the center of the drawing area and the center of the keyword area, or may be the shortest distance between these areas.

  The recognition process is as described above. When such a recognition process is executed, one or a plurality of drawing area data and keyword area data are generated and recorded. The projector 100 creates a list of drawing area data and keyword area data and temporarily stores them, and draws an interactive image by reading the second content using this list in the drawing process of step S3.

  FIG. 10 is a flowchart showing the drawing process in step S3. In this drawing process, the projector 100 determines whether there is drawing area data that has not been referred to in the drawing area data list (step S31). Read (step S32). If there is no unreferenced drawing area data, the projector 100 ends the drawing process.

  The projector 100 determines whether or not the pointer of the read drawing area data indicates “null” (step S33). That is, at this time, the projector 100 determines whether or not keyword area data is associated with the read drawing area data. If the value of the pointer is not “null”, the projector 100 reads the keyword area data with reference to the value, and specifies the drawing area and the keyword (step S34). Further, the projector 100 refers to the content link table, identifies the file path of the second content associated with the keyword identified in step S34, and reads and acquires the second content (step S35).

  Then, the projector 100 draws the interactive image represented by the second content acquired in step S35 in the drawing area specified in step S34 (step S36). At this time, if the size of the drawing area and the size of the interactive image are different, the projector 100 may convert the scale of the interactive image so as to fit the drawing area, and draw at a different magnification. Further, when the shape of the drawing area (for example, the aspect ratio) and the shape of the interactive image are different, the projector 100 arranges the interactive image at an appropriate position in the drawing area.

  When the interactive image is drawn at a predetermined position, the projector 100 deletes the drawing area data read in step S32 from the list (step S37). As a result, the data is reduced by one from the drawing area data list. Thereafter, the projector 100 determines whether there is unreferenced drawing area data in the drawing area data list (step S38), and if there is unreferenced drawing area data, repeats the processing from step S32. On the other hand, if there is no unreferenced drawing area data, the projector 100 ends the drawing process.

  When the recognition process (see FIG. 7) and the drawing process (see FIG. 10) are executed in this way, the second content is sequentially drawn from the one associated with the keyword. Data with a pointer value of “null” remains in the drawing area data list without being deleted, but the data is used for drawing by generating and associating keyword area data.

  FIG. 11 is a diagram illustrating a display example of the locus and interactive image by the user. In the drawing, M1 and M2 represent positioning marks, respectively, and K1 and K2 represent keywords corresponding to the positioning marks M1 and M2, respectively. I1 and I2 represent interactive images corresponding to the set of positioning mark M1 and keyword K1, and the set of positioning mark M2 and keyword K1, respectively.

  As described above, according to the projection system 10, it is possible to draw an image represented by content stored in the storage medium 151 and display it on the projection surface by a user's writing operation. The user can display a necessary image on the projection surface by a relatively simple operation of writing a positioning mark and a keyword. Therefore, the user can display a minute image or an accurate image that is difficult by handwriting in a relatively short time by an operation by writing.

[Second Embodiment]
This embodiment is an embodiment particularly suitable when the above-described interactive image is a moving image. The feature of this embodiment is that it is possible to control the reproduction of an interactive image. The reproduction control here refers to starting or stopping reproduction of an interactive image, which is a moving image, fast-forwarding or rewinding, and further reproducing in slow motion.

  Note that the configuration and operation of this embodiment have many common points with those of the first embodiment. Therefore, in the following description of the present embodiment, descriptions of parts common to the first embodiment are omitted as appropriate. In the description of the present embodiment, the constituent elements described with the same reference numerals as those in the first embodiment mean that the configurations are the same as those in the first embodiment.

  FIG. 12 is a block diagram illustrating a configuration of the projector 100a. The projector 100a is different from the projector 100 of the first embodiment in that a recognition unit 120a is provided instead of the recognition unit 120. The recognition unit 120a is different from the recognition unit 120 in that it includes a control information recognition unit 123 in addition to the position recognition unit 121 and the identification information recognition unit 122 similar to those in the first embodiment. The configurations of the whiteboard 300 and the pen 400 are the same as those in the first embodiment.

  The control information recognition unit 123 is means for recognizing control information for controlling the reproduction of an interactive image that is a moving image based on a trajectory by the pen 400. The control information is information indicating an interactive image reproduction mode. There are a plurality of types of control information, such as information for instructing start of interactive image reproduction and information for instructing stop of interactive image reproduction. These control information is expressed by a predetermined figure as in the case of the positioning mark. This figure is hereinafter referred to as “control mark”. However, the control information may be represented by symbols (characters) instead of graphics.

  FIG. 13 is a diagram illustrating an example of a control mark. The control mark M21 corresponds to an instruction to stop the reproduction of the interactive image, and the control mark M22 corresponds to an instruction to start the reproduction of the interactive image. The control mark M23 corresponds to an instruction to rewind the reproduced interactive image, and the control mark M24 corresponds to an instruction to fast-forward the reproduced interactive image.

  The projector 100a stores a table in which such control marks and control information are associated with each other, and the control information can be recognized from the locus of the pen 400 by referring to this table. The position of the control mark may be any position as long as only one moving image is displayed on the projection surface, but if a plurality of moving images are displayed on the projection surface, It is desirable that it is a predetermined position in the vicinity. The association between the control mark and the interactive image can be realized in the same manner as the association between the positioning mark and the interactive image.

  As a method for entering the control mark, the following method can be cited. For example, in the case where the interactive image is started to be reproduced, and once stopped, the reproduction is started again, a method of sequentially writing the control marks M22, M21, and M22 in this order can be employed. Alternatively, if the locus of the pen 400 can be erased by an eraser (whiteboard eraser), a method is adopted in which the control information is validated by entering a control mark and the control information is invalidated by erasing the control mark. You can also A specific example of this method is that if the control mark M24 is additionally written in the state where the control mark M22 is written, the interactive image reproduction is fast-forwarded. If only the control mark M24 is erased in this state, the fast-forwarding is canceled and the interactive image is interactively displayed. The image will be played back at its original speed.

  The control information of the present embodiment is not limited to the above-described example, and may be information for controlling the image quality (brightness, saturation, contrast, etc.) of the interactive image, for example. Further, the control marks M21 to M24 shown in FIG. 13 are merely examples, and it is of course possible to use other figures.

  Further, in the present embodiment, the projector 100a may draw an image corresponding to the control mark, instead of the user writing the control mark. For example, when the user designates a drawing area and writes a character string such as “moving image control” as a keyword, the projector 100a recognizes this keyword and draws an image corresponding to the control mark in the recognized drawing area. In this case, the user may instruct a desired mark from among the control marks displayed on the projection surface with the pen 400, and the projector 100a may recognize the instructed position, thereby instructing the reproduction mode of the interactive image. it can. Note that the control mark in this case is not for indicating the reproduction mode of the interactive image, but may be for indicating the reproduction mode of the original image.

  Furthermore, in the present embodiment, the second acquisition unit 140 includes a plurality of input terminals, and the drawing control unit 160 may draw an image corresponding to the first content input via the input terminals. Good. The input terminals here are, for example, an S terminal, a VGA (Video Graphics Array) terminal, an HDMI (High-Definition Multimedia Interface) terminal, and the like. That is, the projector 100a in this case can switch the input source. In this case, when the user designates a drawing area and writes a character string such as “switch source” as a keyword, the projector 100a displays an image (for example, “source 1”, “ An image showing each input source such as “source 2” is drawn. In this case, the user designates a desired source from the input sources displayed on the projection surface with the pen 400, and the projector 100a recognizes the designated position, thereby instructing the reproduction mode of the original image. it can.

[Modification]
The present invention is not limited to the above-described embodiment, and can be implemented in various modes exemplified below. Moreover, this invention can be implemented also in the aspect which combined multiple modifications shown below as needed.

(1) The present invention does not require the first content or the second content to be stored in the projector 100 in advance. For example, the projector 100 may be configured to be communicably connected to an external device (such as a Web server or an image database) and acquire first content and second content stored in the external device. In this case, the projector 100 may transmit the above-described keyword as a search query to an external device and receive the second content as a search result.

(2) The identification information of the present invention does not need to be associated with the file path by the content link table like the keyword described above. For example, the identification information may be the file name itself of the content, or may be embedded as metadata in the content. When such identification information is used, data corresponding to the content link table is unnecessary.

  Further, the identification information of the present invention may be information representing the color or shape of a locus (that is, a positioning mark) that designates a drawing area. That is, the identification information does not need to be information representing characters such as keywords and file names. Such identification information is, for example, that one content corresponds to a drawing area defined by a red color material, and another content corresponds to a drawing area defined by a green color material. This is data describing a rule that a certain content corresponds to the drawing area defined by the positioning mark M11 and another content corresponds to the drawing area defined by the positioning mark M12 in FIG. In this case, the identification information recognition unit 122 recognizes the identification information based on the color or shape of the locus written by the user, and determines the correspondence between the drawing area and the content.

The identification information may include both information representing a keyword and a file name and information representing the color and shape of the positioning mark, and the content may be uniquely specified by a combination thereof.
Further, the identification information is used when the interactive image drawn on the projection surface is a specific single image or when a plurality of predetermined interactive images are drawn on the projection surface in a predetermined order. It is unnecessary. In this case, the user only has to specify the drawing area by a writing operation, and does not need to specify the image to be drawn.

(3) The drawing control unit 160 can also perform control to update the interactive image when the locus recognized by the recognition unit 120 changes to satisfy a predetermined condition. The trajectory here may be either a trajectory corresponding to a keyword or a trajectory corresponding to a positioning mark. Further, the condition here corresponds to, for example, that these trajectories are deleted or rewritten.

  For example, the drawing control unit 160 may erase the interactive image corresponding to any of the locus corresponding to the keyword and the locus corresponding to the positioning mark. Alternatively, when the drawing control unit 160 adds and extends a straight line of the positioning mark M11 (see FIG. 3), the drawing control unit 160 enlarges the drawing area and changes the scale of the interactive image according to the size of the drawing area. May be redrawn (ie enlarged). Similarly, the drawing control unit 160 reduces the drawing area and changes the scale of the interactive image according to the size of the drawing area when a part of the straight line of the positioning mark M11 (see FIG. 3) is deleted and shortened. Then, the interactive image may be redrawn (that is, reduced).

(4) The projection surface does not have to be a white board, and may be a screen or paper. Further, the pen used for writing the locus does not need to attach a color material to the projection surface, and may irradiate the projection surface with visible light such as red light or infrared light. Such a pen may be capable of changing the wavelength of light to be irradiated according to the operation of the user, or may be a plurality of pens having different wavelengths of light to be irradiated. In this case, the projector 100 is sensitive to the wavelength of light emitted by the pen, and recognizes the trajectory of the symbol based on the emitted light. The projector 100 desirably draws the locus on the projection surface, but drawing the locus is not essential.

  Alternatively, the present invention may be configured to include a detecting unit that detects the position of the pen (or the tip of the pen) on the projection surface and recognize the locus based on the detected position. Such detection means is, for example, a sensor that detects pressure (writing pressure) on the projection surface or a sensor that optically detects the position of the pen tip.

(5) The keyword of the present invention may be configured to include a characteristic predetermined symbol in order to make the distinction from a positioning mark, a control mark, and a symbol other than the keyword more clear. For example, “* (asterisk)” is added to the beginning and end of the keyword of the present invention, and it may be a character string such as “* answer 1 *” or “* answer 2 *”. In this way, the keyword can be accurately recognized even when the user enters various characters other than the keyword on the projection surface.

(6) The above-described recognition processing and drawing processing may be realized not by the operation of the projector alone but by cooperation between the projector and another device.
FIG. 14 is a block diagram showing a configuration of this modification. In the figure, components denoted by the same reference numerals as those in FIG. 2 mean that the configuration is the same as that of the first embodiment. In this example, 100b is a projector, and 200a is an information processing apparatus.

  The information processing apparatus 200a is, for example, a personal computer, a mobile phone, a smartphone, or the like. The information processing apparatus 200a includes a communication unit 210 that communicates with the projector 100b, which is an external device, in addition to the photographing unit 110, the recognition unit 120, the first acquisition unit 130, the second acquisition unit 140, the storage unit 150, and the drawing control unit 160. Prepare. In addition to the projection unit 170, the projector 100b includes a communication unit 180 that communicates with the information processing apparatus 200a that is an external device. The information processing apparatus 200a transmits an image signal via the communication unit 210, and the projector 100b receives the image signal via the communication unit 180. The first acquisition unit 130 can also acquire the first content or the second content via a network such as the Internet, or can acquire the first content or the second content stored in the storage unit 150. is there.

  The storage medium 151 may be a storage medium that is detachable from the information processing apparatus 200a, such as a so-called USB (Universal Serial Bus) memory or DVD (Digital Versatile Disc). In this case, the information processing apparatus 200a only has to read out data from the storage medium 151 (USB port, DVD drive, etc.) instead of the storage unit 150. Furthermore, the storage medium 151 may store not only the second content but also the first content. Note that the fact that the storage medium 151 may be detachable also applies to the first embodiment and the second embodiment.

(7) The projector of the present invention may not have a photographing function. In other words, the projection system of the present invention may be configured to include a digital camera (digital still camera or digital video camera) separately.
FIG. 15 is a block diagram showing a configuration of this modification. In the same figure, the component to which the same code | symbol as FIG. 2 or FIG. 14 was attached | subjected means that the structure is the same as that of 1st Embodiment. In this example, 100c is a projector and 200b is a digital camera.

  The digital camera 200b includes a photographing unit 110 and a communication unit 220 that communicates with a projector 100c that is an external device. In addition, the projector 100c includes a communication unit 180 of Modification 6 instead of the imaging unit 110 in the configuration of the projector 100 of the first embodiment. The digital camera 200b and the projector 100c transmit and receive image data via the communication units 220 and 180. Communication by the communication units 220 and 180 may be either wireless communication or wired communication.

  Furthermore, in the projection system of the present invention, the digital camera 200b of the present modification and the information processing apparatus 200a of the modification 6 may be configured integrally. In other words, the present invention may be configured to include a projector that does not have a photographing function and an information processing apparatus that has a photographing function and can perform recognition processing and drawing processing. Such an information processing apparatus is, for example, a smartphone with a photographing function or a so-called tablet PC (Personal Computer).

DESCRIPTION OF SYMBOLS 10 ... Projection system, 100, 100a, 100b, 100c ... Projector, 110 ... Shooting part, 120, 120a ... Recognition part, 121 ... Position recognition part, 122 ... Identification information recognition part, 123 ... Control information recognition part, 130th DESCRIPTION OF SYMBOLS 1 acquisition part, 140 ... 2nd acquisition part, 150 ... Memory | storage part, 151 ... Storage medium, 160 ... Drawing control part, 170 ... Projection part, 180 ... Communication part, 100c ... Information processing apparatus, 200a ... Information processing apparatus, 200b ... Digital camera, 210, 220 ... Communication unit, 300 ... White board, 400 ... Pen

Claims (8)

A recognition unit for recognizing an image to be drawn and a drawing area for drawing the image based on a locus of a symbol written on the projection surface;
An acquisition unit for acquiring image data representing the image recognized by the recognition unit;
A drawing control unit that controls to draw the image represented by the image data acquired by the acquiring unit in the drawing area recognized by the recognition unit of the projection surface. The acquisition unit acquires the image data and identification information associated with the image data,
The recognition unit includes a position recognition unit that recognizes a drawing area designated on the projection surface based on the trajectory, and an identification information recognition unit that recognizes the identification information based on the trajectory,
The drawing control unit causes the image represented by the image data associated with the identification information recognized by the identification information recognition unit to be drawn in the drawing area recognized by the position recognition unit of the projection surface. The projector according to claim 1. The identification information includes a predetermined keyword,
The projector according to claim 2, wherein the identification information recognition unit recognizes the identification information by determining whether or not the keyword is included in the trajectory. The position recognition unit recognizes a plurality of the drawing areas,
The identification information recognition unit recognizes a plurality of the identification information,
The drawing control unit determines a correspondence relationship between the drawing area and the identification information based on a position of the drawing area and the identification information or an order in which the drawing area and the identification information are recognized. The projector according to claim 2 or 3. The identification information includes information representing a color or shape of a locus that specifies the drawing area,
The projector according to claim 2, wherein the identification information recognition unit recognizes the identification information based on a color or a shape of the trajectory. The recognition unit includes a control information recognition unit that recognizes control information for controlling reproduction of an image based on the trajectory,
The projector according to claim 1, wherein the drawing control unit controls image reproduction according to control information recognized by the control information recognition unit. The projector according to any one of claims 1 to 6, wherein the drawing control unit updates the image when a locus recognized by the recognition unit changes to satisfy a predetermined condition. . Recognizing the image to be drawn and the drawing area for drawing the image based on the locus of the symbol written on the projection surface,
Obtaining image data representing the recognized image;
The image drawing method, wherein the image represented by the acquired image data is drawn in the recognized drawing area of the projection surface.

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